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Your questions reveal the power of the TVFool charts. The mileage claims are one way antenna manufacturers can relate antenna gain to something easier to understand. Higher gain antennas should receive signals from a greater distance, and this is true if all stations were broadcasting with equal facilities. However, they don't.
Also, antenna gain is a comparison of how sensitive the antenna is in a given direction compared to a theoretical antenna that is equally sensitive in all directions (an isotrope). Antennas with high gain are very sensitive over a small range of azimuths and very insensitive in all other directions. Antennas with lower gain are more sensitive over a wider span of azimuths while being at worst nay modestly insensitive in other directions.
Your report shows strong signals over a wide range of directions. Guess which type of antenna was recommended?
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